Abstract
The aim of the study has been to assess the role of litho-morphogenetic, hydrologic and anthropogenic factors influencing spatial variability of sorptive and buffer properties of the soils of erosional-denudational valley incised in hollow sediments flat-dipping glacial till in the area of Slawienska Plain. Parent material properties, water - as a causative agent of erosion and ions carrier, as well as the quantity and the properties of organic matter were basic factors influencing spatial variability of sorptive and buffer properties of the examined soils. The sorption capacity of Stagnic Dystric Cambisols of the high plain formed of strongly acid, silt-clay hollow sediments ranged from 8.74 to 22.12 cmol(+) kg-1. Acidic cations dominated in the sorption complex of the soils, but its percentage decreased with depth. Colluvic Regosols of the slopes had a lower content of clay and organic matter in relation to the soils of the high plain which was reflected in a lower sorption capacity. The cation exchange capacity of Colluvic Gleysols and Mollic Gleysols of the bottom of the valley ranged from 7.21 to 25.68 cmol(+) kg-1 and was positively related to the content of soil organic matter and clay. The high base saturation of the soils (97.2–100.0%) was an effect of the influence of supplying water. Calcium dominated among base cations. The soils of the high plain and slopes had high buffering capacity of basis and low of acids. Higher buffering capacity of acids found in the soils of the valley bottom was an effect of almost full saturation of soil sorption complex with exchangeable basis.
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